Single-particle spectrum for a model of fermions interacting with two-level local excitations on a lattice: A dynamical CPA approach

Details Single-particle spectrum for a model of fermions interacting with two-level local excitations on a lattice: A dynamical CPA approach Single-particle spectrum for a model of fermions interacting with two-level local excitations on a lattice: A dynamical CPA approach

2006-05-02

arxiv.org/abs/cond-mat/0605050v1

Phys.Lett.A357, 384 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

9 pages, 2 figures, Physics Letters A, accepted

Scientific paper

10.1016/j.physleta.2006.04.058

The problem of motion of a single electron interacting with a periodic lattice of two-level systems is investigated within a spinless fermion model. The Green's function is calculated in a single-site dynamical coherent potential approximation which is equivalent to DMFT. The picture of one-electron density of states is obtained for various values of the tunnel splitting and coupling between the electron and two-level system. The occurrence of a band splitting with increase of the coupling is demonstrated.

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